JP2007110481A - Audio controller and correcting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an audio controller and a correcting device that correct a voice of a navigation part and a musical piece of an audio device, which are output in a means of transport, such as a vehicle and an electric train, into a clear sound. <P>SOLUTION: The audio controller 1 of the present invention is equipped with: an audio source 2; a navigation unit 3 which provides map information and information for a route guide; a DSP/bus/treble circuit 4 which corrects a reproduced sound; a microcomputer 5 which controls the whole audio controller 1; a volume circuit 6 for controlling sound volume; a speaker driving circuit 8 which is connected to a speaker 7 outputting a sound and controls driving of the speaker 7; a microphone 13 for noise detection which picks up noise in the vehicle; a crank position sensor 14 which detects a pulse signal; and a vibration sensor 15 which detects a vibrating state of the vehicle. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for correcting an output level of audio / music output from an audio output device mounted on a vehicle in accordance with traveling noise of the vehicle.

In recent years, car navigation devices that are installed in automobiles and provide road guidance, destination information, and the like, and car audio devices that output music recorded on a medium such as a CD, MD, and HDD have been widely used. Along with this, these devices are standardized on vehicles, and many users (drivers and passengers) enjoy music in the vehicle and search for routes to destinations.

  However, when an automobile is driven, road noise is generated due to friction between the tire and the road surface. In particular, when driving on rough roads, road noise increased, making it difficult to hear audio and music.

In order to solve such a problem, an apparatus has been invented in which a microphone is provided in an automobile, noise is collected from the microphone, and the volume of sound or music is increased according to the magnitude of the noise. . For example, Patent Document 1 is an invention of a car navigation device that increases the pitch of navigation voice according to the vehicle speed, and Patent Document 2 is an acoustic correction system that corrects high and low frequencies according to the vehicle speed and the sound level. It is an invention of an acoustic correction program, an acoustic correction method, and an acoustic correction device. Patent Document 3 is an invention of an audio correction device that increases the output of a low sound as the vehicle speed increases. It is an invention of an audio signal processing apparatus that divides 200 Hz or less and compresses 200 Hz or less in accordance with the vehicle speed, and adds and outputs the result.

According to these inventions, when the vehicle speed is increased, the output volume can be set higher, so that it is possible to prevent the sound and music from being inaudible due to noise.
JP-A-11-281388 JP 2004-228937 A JP-A-6-85581 Japanese Patent No. 3373103

  By the way, as described above, the conventional technology is based on the technical idea that the volume of the sound or music output from the car navigation device or the car audio device is larger than the volume of the road noise.

  However, increasing the volume of voice or music sometimes generates a frequency band that is difficult to hear. For example, when a vehicle is traveling at a high speed, it is difficult to hear frequencies near the high frequency range, and when traveling at a low speed, it is difficult to hear frequencies near the low frequency range.

  Furthermore, depending on the noise type (noise frequency) / magnitude, as shown in FIG. 6, when the low frequency of the voice or music is increased so as not to be defeated by the noise magnitude (see A in FIG. 6). ), It was difficult to hear the frequency band of human voices included in the music.

  Accordingly, the present invention provides a voice control device and a correction device for correcting the sound of a car navigation device and the music of a car audio device, which are output in a vehicle accompanying movement of a vehicle, a train, etc., into clear sound. Is an issue.

  The present invention has been made in view of the above matters. That is, the present invention is mounted on a vehicle and reproduces sound data, a speaker that outputs sound data reproduced by the reproduction means, and an output from the speaker. Noise detection means for detecting driving noise generated by the traveling of the vehicle other than the generated sound data, and the frequency component of the sound data reproduced by the reproduction means within a predetermined range based on the result detected by the noise detection means. The correction means lowers the level of the frequency component of the sound data reproduced by the reproduction means in the same frequency band as the frequency band of the running noise.

As a playback means of the present invention, an audio playback section (including a vehicle-mounted car audio device) that plays back music data recorded on a recording medium, a navigation section that provides vehicle travel guidance, or a receiving means is provided. For example, a receiving device that outputs a voice can be used. Audio device and navigation unit are DVD (Digital Versatile Disk), CD (Compact
Music and voice data recorded on recording media such as Disk) and MD (Mini Disk) can be reproduced. The sound data reproduced by these devices is output from a speaker provided in the vehicle. As a result, the driver and passengers of the vehicle can view music in the vehicle and use the voice road guidance function.

  However, as the vehicle travels, noise such as engine noise and road noise caused by friction between the tire and the road surface (hereinafter referred to as travel noise) is generated, and the driver and passengers in the vehicle In some cases, it was difficult to hear the output music and voice guidance. This is because the sound intensity level (dB) of several frequency components among the multiple frequency components of engine sound and road noise rises to the same level as the frequency components of music and audio output from the speaker. Because.

  Therefore, the correcting means of the present invention corrects the frequency component level of the sound data reproduced by the reproducing means so as to approach the frequency component level of the running noise. At this time, the correction means corrects the level of the frequency component of the sound data within a predetermined range of running noise, for example, within a low band range. As a range of the low band here, a range of 200 Hz or less can be exemplified.

  By the correction within the predetermined range by the correcting means, the output level of the travel noise in the low band of the travel noise approaches the output level of the low band in the sound data, so the output of the travel noise becomes inconspicuous. Since the frequency band of the human voice is 100 Hz to 4 kHz, the voice of the person in the sound data (music, voice) can be converted to the running noise by not changing (lowering) the level of the frequency component in the frequency band in this range. Can stand out more.

  Furthermore, by bringing the level of the frequency component of the sound data of music and voice guidance close to the level of the frequency component of running noise, the level of the frequency band of the human voice of music and voice guidance is relatively increased. . This makes it easier for the driver and passengers to hear vocals and voice guidance during music while the vehicle is running. The present invention can be suitably used for ships, airplanes and the like in addition to vehicles such as automobiles and trains.

Also, from the overall level except for a temporary increase in level, it is considered that the level (dB) of running noise is lower than the level of human voice in the sound data of music and voice guidance. That is, the correction means according to the present invention performs correction to reduce the level of the frequency component in the sound data in the same band as the frequency band of the running noise to the same level as the level of the frequency component of the running noise.
As a result, the frequency component of the human voice frequency band becomes conspicuous.

  As a result, the driver and passengers of the vehicle can enjoy music even in the vehicle in which the traveling noise has occurred, and can listen to voices such as route guidance and traffic information clearly. The present invention is not limited to music / sound recorded on media such as CD, MD, and DVD, but may be based on AM / FM radio.

  Moreover, the noise detection means according to the present invention can predict noise based on a pulse signal generated as the vehicle travels. At this time, the correction means according to the present invention preferably corrects the level of the frequency component of the sound in accordance with at least one of the vehicle running speed and acceleration calculated from the pulse signal.

  For example, a crank position sensor can be suitably used as the noise detection means. When the crank position sensor as the noise detecting means detects the pulse signal and the vehicle speed is calculated as 80 km / hour from the pulse signal, the correcting means determines that the running noise is larger than when the vehicle speed is 40 km / hour. Then, correction is performed to reduce the level of the frequency component of the sound data of the music / voice guidance in the band corresponding to the frequency band of the running noise.

  Thus, according to the present invention, each frequency component level (output level) of running noise can be predicted according to the vehicle speed and acceleration, and the frequency of music / speech can be determined according to the level of the frequency component of running noise. Component level correction can be performed.

  Also, the noise detection means according to the present invention can be a microphone that is attached near the reproduction means and collects running noise.

  By installing a microphone, noise in the vehicle can be directly measured. Therefore, it is possible to collect noise that is infinitely close to the noise that is actually heard by the driver and passengers in the vehicle.

  Thereby, the correction means can perform more suitable correction, and the driver and the passenger can listen to the music / voice guidance more clearly.

  Further, the noise detecting means according to the present invention may be provided as a vibration measuring means provided in a vehicle and measuring the magnitude of vibration of the vehicle. For example, a vibration sensor is installed in a vehicle, and based on the detection result from the vibration sensor, the correction means estimates the magnitude of road noise generated by friction between the tire and the road surface, and the frequency component of music / voice guidance. Perform level correction.

  Thereby, even when the vehicle travels on a rough road surface such as a gravel road or a mountain road, it is possible to prevent as much as possible music and voice guidance from becoming difficult to hear due to travel noise.

  In addition, the present invention is a correction device that is attached to an audio output device mounted on a vehicle and corrects sound data reproduced by a reproduction process of the audio output device, and is output from a speaker provided in the audio output device. The noise detection means for detecting driving noise other than the sound data, and the frequency components of the sound data output by the sound output device are corrected within a predetermined range based on the result detected by the noise detection means. And a correction means for performing the above.

  That is, the correction device of the present invention can be separated from the audio device and the navigation device. ADVANTAGE OF THE INVENTION According to this invention, it can utilize versatile for the existing audio apparatus and car navigation apparatus.

  According to the present invention, it is possible to provide a voice control device and a correction device that correct a voice of a car navigation device or a music of an audio device, which is output in a vehicle accompanied by a movement of a vehicle, a train, or the like into a clear sound. It becomes possible.

  Hereinafter, a voice control device and a correction device of the present invention will be described in detail with reference to the drawings. In addition, although the vehicle in this embodiment is demonstrated as an automobile, application of this invention is not restricted to this.

  First, the voice control device of this embodiment will be described.

As shown in FIG. 1, the audio control apparatus 1 of this embodiment is a DVD (Digital Versatile Disk).
), CD (Compact Disk), MD (Mini Disk) and other playback means for outputting music and sound recorded on a recording medium, and sound and music sound data received by the radio receiver and TV receiver. An audio source (reproducing means) 2 comprising each receiving means for outputting, a navigation unit (reproducing means) 3 having a recording area such as a hard disk storing map information and providing map information and route guidance information, and an audio source 2 and a DSP / bus treble circuit (correction means) 4 for correcting the sound reproduced by the navigation unit 12, a microcomputer 5 for controlling the entire voice control device 1, a volume circuit 6 for adjusting the volume, A speaker drive circuit (power IC) 8 that controls the drive of the speaker 7 connected to the speaker 7 that outputs sound is provided.

The microcomputer 5 of the present embodiment has a memory 9 in which an OS (Operating System) 10 that is a basic program of the microcomputer 5, an application program 11 for various controls, and an execution of the application program 11 are stored. And a table 12 storing various data to be used.

  Furthermore, the voice control device 1 according to the present embodiment includes a noise detection microphone 13 that collects sound (noise) in the vehicle, a crank position sensor 14 that detects a pulse signal generated as the vehicle travels. And a vibration sensor 15 provided on at least one of the inside and the outside of the vehicle and detecting the vibration state of the vehicle. The vibration sensor 15 is particularly effective for detecting noise generated by friction between the tire and the road surface.

  Moreover, although the noise detection microphone 13 of the present embodiment is provided on the front surface of the main body of the navigation unit 3, this position is not particularly limited. In the description of the present embodiment, the noise in the vehicle collected by the noise detection microphone 13 and the road noise calculated from the detection results of the crank position sensor 14 and the vibration sensor 15 are combined and described as traveling noise. To do.

  The table 12 stores data in which at least one value of the traveling speed, acceleration, and vibration of the vehicle is associated with the value of the frequency data correction amount. The data stored in the table 12 is, for example, the relationship between the speed and the noise level. When the traveling speed is 20 km / h, the traveling noise is 80 dB. When the traveling speed is 80 km / h, the traveling noise is 65 dB. When the traveling speed is 40 km / h, each data is associated and stored in the table 12 such that the traveling noise is 50 dB. Note that values corresponding to running noise are also stored in the table 12 in the acceleration and vibration data.

  In addition, the voice control device 1 of the present embodiment includes an A / D converter 16 that converts digital signals output from the audio source group 2 or the navigation unit 3 and noise collected by the noise detection microphone 13 into digital data. And a D / A converter 17 for converting the digital data corrected by the DSP / bus treble circuit 4 into analog data.

The above is the configuration of the voice control device 1 of the present embodiment.
<Frequency correction of sound data>
Next, correction of sound data in the voice control device 1 of the present embodiment will be described in detail based on the flowchart shown in FIG.

  First, the voice control device 1 adjusts the frequency component level at the time of reproduction of sound data such as music and voice recorded on a recording medium such as a CD or MD, by using a noise detection microphone 13 to adjust noise in the vehicle. Sound is collected and road noise is measured by the crank position sensor 14 and the vibration sensor 15 (S01).

  The crank position sensor 14 detects a pulse signal generated as the vehicle travels. From this pulse signal, the running speed and acceleration of the vehicle can be calculated. In many cases, the road noise increases as the traveling speed increases or the acceleration increases.

  Further, the vibration sensor 15 detects vibration generated in the traveling vehicle. When driving on uneven road surfaces or gravel roads, vibrations increase. As the vibration increases, the noise in the car also increases.

  Then, the microcomputer 5 calculates the traveling speed or acceleration of the vehicle from the pulse signal detected by the crank position sensor 14 and extracts the frequency correction amount associated with the traveling speed or acceleration from the table 12. Further, the microcomputer 5 extracts from the table 12 a correction amount of the frequency associated with the vibration amount during vehicle travel detected by the vibration sensor 15. The correction amount of the frequency component is set in consideration of the magnitude of noise predicted according to the travel speed, acceleration, and vibration amount.

  In the present embodiment, at this stage, the microcomputer 5 determines whether the road noise calculated from the pulse signal and the vibration amount and the noise in the vehicle collected by the noise detection microphone 13 are 80 dB or more. (S02). Here, if the microcomputer 5 determines that the running noise is 80 dB or more, the DSP / bus treble circuit 4 is instructed to correct the frequency component level of the sound data in the same band as the high frequency band level of the running noise. (S03).

  Upon receiving a command from the microcomputer 5, the DSP / bus treble circuit 4 converts the frequency component level of the sound data into a high frequency band level (for example, 0 to 100 Hz) of the running noise as shown in FIG. Is corrected to −5 dB within the same band range (see B in FIG. 3). Note that the thin solid line in the graph of FIG. 3 is the waveform of running noise, the broken line is the waveform of sound data before correction, and the thick solid line shows the waveform of sound data after correction.

  In step 02, if the microcomputer 5 determines that the running noise is not 80 dB or more, it determines whether it is 65 dB or more (S03). If the microcomputer 5 determines that the running noise is 65 dB or more, it issues a command to the DSP / bus treble circuit 4 to correct the bus output level in the sound data (S05).

  In response to the command from the microcomputer 5, the DSP / bus treble circuit 4 adjusts the frequency component level of the sound data in the same band as that of the high frequency component level of the running noise to -3 dB.

  In step 04, if the microcomputer 5 determines that the running noise is not 65 dB or more, it determines whether it is 50 dB or more (S06). Here, when the microcomputer 5 determines that the running noise is 50 dB or more, the DSP / bus treble circuit 4 is instructed to correct the frequency component level of the sound data in the same band as the high frequency band level of the running noise. (S07).

  In response to the command from the microcomputer 5, the DSP / bus treble circuit 4 adjusts the frequency component level of the sound data in the same band as the high frequency band level of the running noise to -2 dB. In this embodiment, if it is determined in step 06 that the running noise is not 50 dB or more, the process is terminated without adjusting the frequency component level of the sound data.

  As described above, by reducing the frequency level in the low band (for example, 0 to 100 Hz) of the sound data in accordance with the level of the running noise level, it becomes easier to hear a human voice in the sound data.

  In many cases, when running noise occurs, sound data becomes difficult to hear. In order to solve this problem, when the volume level of the sound data itself is increased, a band that is difficult for the viewer to hear may be generated. In particular, a band of 100 Hz to 4 kHz, which is a human voice band, becomes a sound that is difficult for the viewer to hear by increasing the volume level when the running noise is 50 dB or more. In other words, when music with vocals is played back with car audio, the vocals cannot be heard in a vehicle with a running noise of 50 dB or more.

  However, according to the voice control device 1 of the present embodiment, the frequency component of the sound data in the same band as the band where the level of the frequency component of the running noise is high is lowered. As a result, the level of the frequency component in the other band of the sound data can be emphasized, and as a result, a sound that allows the viewer to easily hear the vocal sound can be output.

  Further, by installing the noise detection microphone 13 on the deck of the navigation unit 3 set in the vehicle, the noise in the vehicle can be directly measured. As a result, it is possible to collect noise that is infinitely close to the noise that is actually heard by the driver and passengers in the vehicle. Therefore, it is possible to adjust the sound data and output from the speaker 7 a sound that is most audible to the driver and passengers without worrying about running noise.

  Furthermore, according to the voice control device 1 of the present embodiment, since the clarity of the human voice band can be increased, the navigation unit during traveling on roads with poor road surface conditions such as mountain roads and gravel roads. The voice of road guidance can be output clearly without being drowned out by driving noise.

  The voice control device 1 of the present embodiment has been described in which the navigation unit 3 and the audio source 2 are integrated with the voice control device 1 as means for reproducing sound data. However, as shown in FIG. The source (reproducing unit) may be a separate unit, and only a control system that performs level correction of frequency components of sound data, such as the DSP / bus treble circuit 4, the microcomputer 5, and the volume circuit 6, may be used as a correction device.

The voice control apparatus according to the present embodiment can be connected to a mobile phone having a hands-free function capable of performing transmission / reception with the mobile phone without holding the mobile phone by hand. In addition, since the audio | voice control apparatus of a present Example has the same structure as the audio | voice control apparatus of Example 1, the same code | symbol is attached | subjected about the structure which overlaps. In the present embodiment, the case where the mobile phone is used in a car is described, but the present invention is not particularly limited thereto.

  As shown in FIG. 5, the voice control device 1 of this embodiment is connected to a mobile phone 20 and a speaker 7 that outputs a voice received by the mobile phone 20. The mobile phone 20 is an existing one and has a general mobile phone structure. Connection between the mobile phone 20 and the voice control device 1 can be performed at a power supply terminal or an earphone terminal of the mobile phone 20.

  The voice control device 1 according to the present embodiment also includes a DSP / bus treble circuit 4 that corrects the voice received from the mobile phone, a microcomputer 5 that controls the voice control device 1 as a whole, and the volume of the received voice that is output. And a speaker drive circuit 8 connected to a speaker 7 for outputting the received voice and controlling the driving of the speaker 7.

The above is the configuration of the voice control device 1 of the present embodiment.
<Frequency correction of sound data>
Next, correction of received voice in the voice control device 1 of the present embodiment will be described in detail.

  First, the voice control device 1 measures running noise by the noise detection microphone 13, the crank position sensor 14, and the vibration sensor 15 in order to adjust the frequency component of the received voice of the mobile phone 20.

  Then, the microcomputer 5 calculates the traveling speed or acceleration of the vehicle from the pulse signal detected by the crank position sensor 14 and extracts the frequency correction amount associated with the traveling speed or acceleration from the table 12. Further, the microcomputer 5 extracts from the table 12 a correction amount of the frequency associated with the vibration amount during vehicle travel detected by the vibration sensor 15.

  In the present embodiment, at this stage, the microcomputer 5 determines whether or not the running noise that combines the pulse signal and the vibration is 80 dB or more. If the microcomputer 5 determines that the running noise is 80 dB or more, it issues a command to the DSP / bus treble circuit 4 to correct the output level of the bass band in the received voice data.

  In response to the command from the microcomputer 5, the DSP / bus treble circuit 4 sets the frequency component level of the received voice data within the same band as the band where the frequency component level of the running noise is high (for example, 0 to 100 Hz). To -5 dB.

  If the microcomputer 5 determines that the running noise is not 80 dB or more, it determines whether it is 65 dB or more. If the microcomputer 5 determines that the running noise is 65 dB or more, the microcomputer 5 issues a command to the DSP / bus treble circuit 4 to correct the frequency component level (output level) of the bass band in the received voice data.

  In response to the command from the microcomputer 5, the DSP / bus treble circuit 4 adjusts the level of the frequency component of the received voice data to -3 dB within the same band as the band where the frequency component level of the running noise is high.

  Further, if the microcomputer 5 determines that the running noise is not 65 dB or more, it determines whether or not it is 50 dB or more. If the microcomputer 5 determines that the running noise is 50 dB or more, it issues a command to the DSP / bus treble circuit 4 to correct the frequency component level of the bass band in the received voice data.

In response to the command from the microcomputer 5, the DSP / bus treble circuit 4 adjusts the frequency component level of the received voice data so that it becomes −2 dB within the same band as the band where the frequency component level of the running noise is high. . In the present embodiment, when it is determined that the running noise is not 50 dB or more, the process is terminated without adjusting the frequency component of the received voice data.

  In this way, by reducing the frequency component level in the low frequency range of the received voice data according to the level of the running noise level, the high frequency range in the received voice can be easily noticed.

  In addition, by installing the noise detection microphone 13 on the deck of the navigation unit 3 set in the vehicle, it is possible to directly measure the noise in the vehicle, so that the driver and passengers in the vehicle can actually Noise close to the audible noise can be detected. As a result, the received voice data can be adjusted, and the received voice that is most audible to the driver and passengers can be output from the speaker 7 without worrying about running noise.

  Furthermore, according to the voice control device 1 of the present embodiment, it is possible to output clear received voice from the mobile phone 20 running on a road with poor road surface conditions such as a mountain road or a gravel road.

  In the present embodiment, the voice control device 1 and the mobile phone 20 are described as separate units. However, the voice control device of the present invention may be built in a mobile phone. In this case, the microphone for noise detection can be used in combination with a microphone for receiving a mobile phone.

  In addition, the voice control device of the present invention may be configured to lower the level of the noise band and increase the level of other bands.

1 is a block diagram of a voice control device according to Embodiment 1. FIG. It is a correction | amendment control flow by the audio | voice control apparatus of Example 1. FIG. It is a graph which shows the correction | amendment content of the running noise distribution of Example 1, and the frequency component of sound data. It is a block diagram of the audio | voice control apparatus of the other aspect of Example 1. FIG. It is a block diagram of the audio | voice control apparatus of Example 2. FIG. It is a graph which shows the content of correction | amendment of the frequency component of the conventional running noise distribution and sound data.

Explanation of symbols

1 Audio control device 2 Audio source (reproduction means)
3 Navigation part (reproduction means)
4 Bus treble circuit (correction means)
5 Microcomputer 6 Volume circuit 7 Speaker 8 Speaker drive circuit 9 Memory 10 OS
11 Application program 12 Table 13 Microphone for noise detection (noise detection means)
14 Crank position sensor (noise detection means)
15 Vibration sensor (vibration measuring means)
16 A / D converter 17 D / A converter 20 Mobile phone

Claims (8)

A playback means mounted on the vehicle for playing back sound data;
A speaker for outputting the sound data reproduced by the reproducing means;
Noise detection means for detecting running noise other than the sound data output from the loudspeaker, which occurs with the running of the vehicle;
Correction means for correcting the frequency component of the sound data reproduced by the reproduction means within a predetermined range based on the result detected by the noise detection means;
The sound control apparatus according to claim 1, wherein the correction means lowers the level of the frequency component of the sound data reproduced by the reproduction means in the same frequency band as the frequency band of the running noise. The noise detecting means is
The voice control device according to claim 1, wherein noise is predicted based on a pulse signal generated as the vehicle travels.   3. The voice control device according to claim 2, wherein the correction unit corrects the frequency component of the sound according to at least one of a vehicle running speed and an acceleration calculated from the pulse signal. . The noise detecting means is
The voice control device according to any one of claims 1 to 3, further comprising a microphone that is attached in the vicinity of the reproducing means and collects the running noise. The noise detecting means is
The voice control device according to any one of claims 1 to 4, further comprising a vibration measuring unit that is provided in the vehicle and measures the magnitude of vibration of the vehicle. The reproducing means includes
It is at least one of an audio reproducing unit that reproduces music data recorded on a recording medium, a navigation unit that performs driving guidance of a vehicle, or a receiving device that outputs a received sound. The voice control device according to claim 1.   The voice control device according to claim 1, wherein the frequency of the running noise is 200 Hz or less. A correction device that is attached to an audio output device mounted on a vehicle and corrects sound data reproduced by a reproduction process of the audio output device,
Noise detection means for detecting running noise associated with running of the vehicle other than sound data output from a speaker provided in the audio output device;
A correction apparatus comprising: correction means for correcting a frequency component of sound data output from the audio output device within a predetermined range based on a result detected by the noise detection means.

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